* Replace "just run-tags install-all/setup-all,start" with "just install-all/setup-all"

Thanks to the tip by Slavi that the overhead of ensure-matrix-users-created is negligible.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Edit installing instructions

- Move the anchor links to docs/just.md
- Add note about running "ensure-matrix-users-created" tags, if ansible-playbook's tags not "setup-all,ensure-matrix-users-created,start", ie. either "setup-all,start", "setup-email2matrix,start", "setup-aux-files,setup-corporal,start", or "setup-matrix-user-verification-service,start"

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Update descriptions about installation

- Introduce the most conservative and stable raw ansible-playbook command.
- Introduce the just commands on installing.md and maintenance-upgrading-services.md, not on quick-start.md, since it is too early for quick start guide readers who are just starting to climb learning curve to use the shortcuts.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Update docs/configuring-playbook-etherpad.md: remove the note about ensure-matrix-users-created

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

---------

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>
Co-authored-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Replace installation command shortcut for the "just" program with the most conservative raw ansible-playbook command

This commit replaces installation command shortcut ("recipe") for the "just" program with the raw ansible-playbook command, so that the shortcut will be added to it later. The command is so conservative that failure of the command will mean something is clearly broken.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Add comments about using setup-all instead of install-all

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Add description about shortcut command with the "just" program to the ansible-playbook command with "setup-all" and "start" tags

It also explains difference between "just install-all" and "just setup-all" recipes. The explanation is based on docs/playbook-tags.md

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Update raw ansible-playbook command to have it do what "just install-all" or "just setup-all" does

Since "just install-all" or "just setup-all" invokes "ensure-matrix-users-created" as well, it needs adding to the raw ansible-playbook command.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Remove "ensure-matrix-users-created" from the raw ansible-playbook command which does not need it

Also: update the "just" recipes accordingly. "just install-all" and "just setup-all" run "ensure-matrix-users-created" tag as well, therefore they need to be replaced with "run-tags" recipes to skip "ensure-matrix-users-created"

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Update docs/configuring-playbook-etherpad.md: add ensure-matrix-users-created to the raw ansible-playbook

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Add description about "ensure-matrix-users-created" and create a list with description about shortcut commands with "just"

This commit also fixes list item capitalization and punctuation.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Add notes bullet lists

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Update docs/configuring-playbook-matrix-corporal.md and docs/configuring-playbook-email2matrix.md: adopt common instructions

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Replace "run the installation command" with "run the playbook with tags"

Now that shortcut commands for the "just" program are displayed along with the existing "installation command", this commit replaces "run the installation command" with "run the playbook with tags" in order to prevent misunderstanding and confusion.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Add notes about changing passwords of users specified on vars.yml

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Update docs/configuring-playbook-synapse-admin.md: add the playbook command and just recipes

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Remove redundant blank lines

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Update docs/configuring-playbook-alertmanager-receiver.md: remove the direction to proceed to Usage

Such a kind of direction is not used on other documentation, so it should be fine to just remove it.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Update docs/importing-synapse-media-store.md: code block for ansible-playbook

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

---------

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>
Co-authored-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Overall the playbook uses the expression "Add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file:" with the heading "Adjusting the playbook configuration" for sections to explain what to be added as variables

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

This commit introduces a new role that downloads and installs the
prometheus community postgres exporter  https://github.com/prometheus-community/postgres_exporter.
A new credential is added to matrix_postgres_additional_databases that
allows the exporter access to the database to gather statistics.
A new dashboard was added to the grafana role, with some refactoring
to enable the dashboard only if the new role is enabled.
I've included some basic instructions for how to enable the role in
the Docs section.

In terms of testing, I've tested enabling the role, and disabling
it to make sure it cleans up the container and systemd role.